Hot gas engine heater head

Abstract

A heater head for a multi-cylinder solar radiation powered hot gas engine comprises tubes connecting cylinder and regenerator tops. Each tube comprises three parts. A first part of each tube extends along an involute curve on a cone. A second part extends radially outwardly on the same cone while a third part extends radially inwardly and downwardly on another cone.

I claim: 
     
       1. A multiple cylinder hot gas engine heater head in which a plurality of tubes connect the cylinders with the corresponding regenerator housings and in which each tube has a first curved part of a shape which corresponds substantially to the shape of an involute curve on a cone, and in which the tubes are juxtaposed so that constant, small gaps between the curved parts are obtained, characterized in that each tube has a second, radially directed straight tube part starting in continuation of the said first curved part and located on said cone, said second parts leaving between them gaps exceeding the tube diameter, each tube also comprising a third, radially directed straight tube part starting in continuation of said second part and extending so as to be visible in the direction of the cone axis between said second tube parts. 
     
     
       2. A heater head according to claim 1 characterized in that said third tube parts are following a second cone coaxial with but having a smaller cone angle than the said cone of the first and second tube parts.